arch/s390/kernel/processor.c

   1 /*
   2  *  arch/s390/kernel/processor.c
   3  *
   4  *  Copyright IBM Corp. 2008
   5  *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  */
   7
   8 #define KMSG_COMPONENT "cpu"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/smp.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/delay.h>
  16 #include <linux/cpu.h>
  17 #include <asm/elf.h>
  18 #include <asm/lowcore.h>
  19 #include <asm/param.h>
  20
  21 static DEFINE_PER_CPU(struct cpuid, cpu_id);
  22
  23 /*
  24  * cpu_init - initializes state that is per-CPU.
  25  */
  26 void __cpuinit cpu_init(void)
  27 {
  28         struct cpuid *id = &per_cpu(cpu_id, smp_processor_id());
  29
  30         get_cpu_id(id);
  31         atomic_inc(&init_mm.mm_count);
  32         current->active_mm = &init_mm;
  33         BUG_ON(current->mm);
  34         enter_lazy_tlb(&init_mm, current);
  35 }
  36
  37 /*
  38  * show_cpuinfo - Get information on one CPU for use by procfs.
  39  */
  40 static int show_cpuinfo(struct seq_file *m, void *v)
  41 {
  42         static const char *hwcap_str[10] = {
  43                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
  44                 "edat", "etf3eh", "highgprs"
  45         };
  46         unsigned long n = (unsigned long) v - 1;
  47         int i;
  48
  49         if (!n) {
  50                 s390_adjust_jiffies();
  51                 seq_printf(m, "vendor_id       : IBM/S390\n"
  52                            "# processors    : %i\n"
  53                            "bogomips per cpu: %lu.%02lu\n",
  54                            num_online_cpus(), loops_per_jiffy/(500000/HZ),
  55                            (loops_per_jiffy/(5000/HZ))%100);
  56                 seq_puts(m, "features\t: ");
  57                 for (i = 0; i < 10; i++)
  58                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
  59                                 seq_printf(m, "%s ", hwcap_str[i]);
  60                 seq_puts(m, "\n");
  61         }
  62         get_online_cpus();
  63         if (cpu_online(n)) {
  64                 struct cpuid *id = &per_cpu(cpu_id, n);
  65                 seq_printf(m, "processor %li: "
  66                            "version = %02X,  "
  67                            "identification = %06X,  "
  68                            "machine = %04X\n",
  69                            n, id->version, id->ident, id->machine);
  70         }
  71         put_online_cpus();
  72         return 0;
  73 }
  74
  75 static void *c_start(struct seq_file *m, loff_t *pos)
  76 {
  77         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
  78 }
  79
  80 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  81 {
  82         ++*pos;
  83         return c_start(m, pos);
  84 }
  85
  86 static void c_stop(struct seq_file *m, void *v)
  87 {
  88 }
  89
  90 const struct seq_operations cpuinfo_op = {
  91         .start  = c_start,
  92         .next   = c_next,
  93         .stop   = c_stop,
  94         .show   = show_cpuinfo,
  95 };
  96